Is This Coin From Brazil?

Yes, it's definitely brazilian. XX (20) Reis 1821-R(Rio de Janeiro mint) with 52 pearls. The coin itself is not very uncommon. It seems that there was some problem with the die and/or rotation during the striking, then some kind of pressure that can be seen at about 7 o'clock on the reverse. About the grade, much of the finer details are preserved, like the crown. There seems to be more wear on the shield, but the lack of finer details behind the castles indicate that it's a consequence of a weak/problematic strike and/or worn die. It likely didn't look very nice after it was struck. It's worth something, here in Brazil you can get a really nice one for about US$70,00, in this grade for about US$30,00 at it's best.

Very attractive coin.

Best one that sold recently on ebay went for $40: https://www.ebay.com/itm/Brazil-20-...047675.l2557

Interesting. I certainly see some differences between the top example and the two lower ones (some crown details and the alignment of the Xes).

Would that be die variation or counterfeiting? (especially on such a low denomination coin)